Plasma leptin concentrations in physically active men and women in relation to fat mass, fat free mass and selected biochemical variables
Journal Title: Biology of Sport - Year 2006, Vol 23, Issue 1
Abstract
The plasma leptin concentration depends on many factors with a substantial role played by physical activity. The aim of this study was the evaluation of the effects of body fat and fat free mass as well circulating glucose and cortisol on plasma leptin concentrations in active men and women. A total of 26 physical education students (13 men and 13 women)- took part in the study. Their physical activity during the study was only thatrequired by theie study program. No one was engaged in high-performance sports. Fasting blood samples were taken from the antecubital vein into lithium heparin tubes and centrifuged to separate plasma specimens. Plasma leptin levels were determined using radioimmunoassay and commercial kits (Linco, USA). Cortisol was determined by means of ELISA method and IBL kits (Germany). Glucose was assayed by the oxidase method using Randox commercial kits (Randox Laboratories, Great Britain). Body fat was estimated using the BIA method (RJL System INC., USA). Despite the lack of difference in fat mass between sexes circulating leptin in women (6.5 ng•ml-1) was significantly higher than in men (2.4 ng•ml-1). Plasma leptin concentrations in both men and women were not correlated with circulating glucose and cortisol. Moreover, neither in men nor in women were they correlated with the percent of body fat. In contrast, in men plasma leptin levels were significantly correlated with fat mass expressed in kilograms (r=0.56; p<0.05). In women circulating leptin was significantly and inversely correlated with the ratio of fat-free mass to fat mass (r=-0.71; p<0.006). Our results indicate that the effect of body fat on plasma leptin concentrations differs in active men and women, probably due to pronounced fat-free mass effects on plasma hormone levels in women but not in men.
Authors and Affiliations
G Lutosławska, B Wit
Keywords
Related Articles
- EP ID EP58868
- DOI -
- Views 113
- Downloads 0
Changes in handgrip force and blood lactate as response to simulated climbing competition
The aim of the study was to estimate post-competition changes in handgrip strength and blood lactate in climbers and relationships of the studied variables with declared climbing ability of the tested athletes. Twenty on...
Histochemical responses of rats exercised in two weekly frequencies and ingesting standard or hypercaloric diet
This study investigated if overfed rats present morphological and histochemical muscle adaptation similar to normally fed, both submitted to two different weekly frequencies of training. Thirty male Wistar rats were fed...
EXTERNAL BARREL TEMPERATURE OF A SMALL BORE OLYMPIC RIFLE
Investigations on changes in a rifle’s barrel temperature during shooting in a rhythm typical for practitioners of Olympic shooting sports are presented. Walther KK300 (cal. 5.6 mm), a typical rifle often used in Olympic...
Physical performance and antioxidant effects in triathletes
Exercise results in an increased production of reactive oxygen species. Two major classes of endogenous protective mechanisms work together to ameliorate the harmful effects of oxidants in the cell: (1) components of the...
The side-to-side differences in bone mineral status and cross-sectional area in radius and ulna in teenage Taiwanses female volleyball players
Regular physical training has been shown to affect bone development. It has been shown in Caucasians that athletes participated in sports involving long-term unilateral mechanical loading showed significantly larger domi...